Just For Laughs: Saturday's best bet

_

Bob Newhart Chicago Theatre, 7pm.  There are many shows worth attending at tonight's crescendo of the Just For Laughs Chicago comedy festival. In fact, I've written about a number of them over the past few days. But if you're going to see one act this evening, make it the most peerless performer in this year's shebang: Bob Newhart. The former Chicago accountant (a nonpareil example of life imitating art) made his first foray into entertainment with the seminal standup comedy album The Button-Down Mind of Bob Newhart, an influential, Grammy-winning classic that hit #1 on the Billboard chart. A Peabody- and Emmy-winning television career followed, as did a New York Times bestseller and dozens of nights guest-hosting the Tonight Show. A towering figure in comedy, Newhart makes a rare visit to headline the Chicago Theatre.